Calculate Exponential Smoothing Forecast on Query Editor

[Anonymous]

Hi all, I have been searching high and low for a way to populate a column of forecasted values using DAX. Other than forecasting by moving average, I have not been able to find any methods to perform exponential smoothing forecasting using DAX.

I am currently exploring ways to do so on Query Editor. Assume I have the following simple dataset. How do I populate a column containing the forecasted numbers?

Here is the PBIX file:

https://www.dropbox.com/s/wc30mt5kron382t/Inventory%20Forecasting.pbix?dl=0

Thank you!

[v-jiascu-msft]

Hi @Anonymous,

The Exponential Smoothing is a little complicated. There could be a solution here by R.

# 'dataset' holds the input data for this script
temp <- dataset
temp$Date <- as.Date(temp$Date, '%Y-%m-%d')
es <- c()
minDate <- temp$Date[1]
ds_length <- length(temp$Date)
for (index in c(1:ds_length)) {
    if (temp[index,1] == minDate) {
        st <- temp[index, 3]
    }
    else {
        st <- 0.2 * temp[index, 3] + (1 - 0.2) * es[index - 1]
    }
    es[index] <- st
}
temp$es <- es

Best Regards,

Dale

[Mohamed-Ashraf]

Could you please clarify how to make this code reusable to just replace parameters (Date, Value)?

when I executed this code I received an error
(Error in if (temp[index, 1] == minDate) { :
  missing value where TRUE/FALSE needed
Execution halted
)

[Anonymous]

Also, @v-jiascu-msft how do I forecast for the following year? Could you share the code for me (I don't know R language yet)? The calculation you provided only allows for forecasting in the same period.

[Anonymous]

anyone?

[Anonymous]

Thank you @v-jiascu-msft! Could you suggest me some resources to learning R on Power BI?